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Annotation of xinu/sys/arpfind.c, revision 1.1

1.1     ! root        1: /* arpfind.c - arpfind */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <proc.h>
        !             6: #include <network.h>
        !             7: 
        !             8: /*------------------------------------------------------------------------
        !             9:  *  arpfind  -  find or insert entry in ARP cache and return its index
        !            10:  *------------------------------------------------------------------------
        !            11:  */
        !            12: arpfind(faddr)
        !            13: IPaddr faddr;
        !            14: {
        !            15:        int     i;
        !            16:        int     arindex;
        !            17:        struct  arpent  *atabptr;
        !            18: 
        !            19:        for (arindex=0; arindex<Arp.atabsiz; arindex++) {
        !            20:                atabptr = &Arp.arptab[arindex];
        !            21:                if (blkequ(atabptr->arp_Iad, faddr, IPLEN)
        !            22:                        && atabptr->arp_state != AR_FREE)
        !            23:                        return(arindex);
        !            24:        }
        !            25:        if (Arp.atabsiz < AR_TAB) {
        !            26:                Arp.atabsiz++;
        !            27:        }
        !            28:        arindex = Arp.atabnxt++;
        !            29:        if (Arp.atabnxt >= AR_TAB)
        !            30:                Arp.atabnxt = 0;
        !            31:        atabptr = &Arp.arptab[arindex];
        !            32:        atabptr->arp_state = AR_ALLOC;
        !            33:        blkcopy(atabptr->arp_Iad, faddr, IPLEN);
        !            34:        for(i=0 ; i<EPADLEN ; i++)
        !            35:                atabptr->arp_Ead[i] = '\0';
        !            36:        atabptr->arp_dev = -1;
        !            37:        return(arindex);
        !            38: }

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